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Local to Production: Scaling Systems

The Database Problem4

Direct database calls, and why they work at first
Slow queries and why indexes matter
Read replicas and splitting reads from writes
Vertical vs horizontal scaling

Scaling the App Layer4

Caching for Speed4

Async Work & Scheduling4

Putting It All Together4

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Local to Production: Scaling Systems

The Database Problem4

Direct database calls, and why they work at first
Slow queries and why indexes matter
Read replicas and splitting reads from writes
Vertical vs horizontal scaling

Scaling the App Layer4

Caching for Speed4

Async Work & Scheduling4

Putting It All Together4

Learn Local to Production: Scaling Systems The Database Problem

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Slow queries and why indexes matter

The math of scanning a table row by row versus jumping straight to the answer, and how indexes make that jump possible.

11 min readUpdated 2026-09-04databasesperformancescaling